I really want one of these in principal but the £129 asking price is just too high. (The direct Dollar to pound sterling conversion stings a bit too.) Still, as a product they’re going to take some beating in terms of their quality, and integration to the iOS platform. The lock screen for example will show the amount of battery left along with the device’s built in battery. This isn’t possible with third party battery cases.
They’ll also work with Qi-certified chargers, if that’s how you roll. Here’s where you can buy one online if you’re interested: